Question

Q.4. Answer the following questions:

a. Evaporation is a surface phenomenon. Explain the given statement on the basis

of molecular motion

b. Explain boiling on the basis of molecular motion

c. State two points of difference between evaporation and boiling

d. Two iron rods-one 10m long and the other 5m long are heated to the same rise in

temperature. Which rod will expand more and why?

e. One rod of copper and another identical rod of iron are heated to the same rise in

temperature. Which rod will expand more and why?

f. Explain thermal expansion in gases on the basis of molecular motion

g. How does the density of a substance ( solid, liquid , gas) change on heating?​

Answer 1

first we take some water in a bowl, then we heat it for some time.

Then we saw that the water limit is decreaseing and it got evaporate

because water is one type of liquid it's malicules attraction is less than solid so when we heat it it's malicules go farther than them.

For which there malicular attraction got week and they got evaporate.

I answered this question in my manner . I think you may understand it.